[carcraft]

Why isn’t it working on my grass?

[BitWielder1]

Why isn't it working on my grass?

Good question.
My guess is your grass (and mine) is missing a nutrient other than CO₂.
I'm going to get some lawn fertilizer (only to help sequester some of those bad greenhouse gases of course).

[Thibodeaux]

——Why isn’t it working on my grass?——

the damper nodulus cuts in when the internal CO2 level reaches the limit imposed by the genes specific to the kind of grass.

to improve grass, add nitrogen and potash and phosphate

[smokingfrog]

You need to aerate your lawn so the CO2 can get down to the roots.